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// From Brandon Jones' awesome WebGL texture utils,
// https://github.com/toji/webgl-texture-utils
// which in turn based off of Evan Parker's cool work,
// http://www-cs-students.stanford.edu/~eparker/files/crunch/decode_test.html
//
// This combines crunch-worker.js and crn_decomp.js. Minor changes
// to make it work that way, and to return all levels in one array
/*
* Copyright (c) 2012 Brandon Jones
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
*/
// Taken from crnlib.h
var cCRNFmtInvalid = -1;
var cCRNFmtDXT1 = 0;
var cCRNFmtDXT3 = 1;
var cCRNFmtDXT5 = 2;
// Various DXT5 derivatives
var cCRNFmtDXT5_CCxY = 3; // Luma-chroma
var cCRNFmtDXT5_xGxR = 4; // Swizzled 2-component
var cCRNFmtDXT5_xGBR = 5; // Swizzled 3-component
var cCRNFmtDXT5_AGBR = 6; // Swizzled 4-component
// ATI 3DC and X360 DXN
var cCRNFmtDXN_XY = 7;
var cCRNFmtDXN_YX = 8;
// DXT5 alpha blocks only
var cCRNFmtDXT5A = 9;
function arrayBufferCopy(src, dst, dstByteOffset, numBytes) {
dst.set(src.subarray(0, numBytes), dstByteOffset);
}
function deCrunch(bytes, filename) {
var srcSize = bytes.length;
var src = Module._malloc(srcSize),
format, internalFormat, dst, dstSize,
width, height, levels, dxtData, rgb565Data, i;
arrayBufferCopy(bytes, Module.HEAPU8, src, srcSize);
format = Module._crn_get_dxt_format(src, srcSize);
if(format != cCRNFmtDXT1 && format != cCRNFmtDXT3 && format != cCRNFmtDXT5) {
throw "Unsupported image format " + format + " for " + filename;
}
width = Module._crn_get_width(src, srcSize);
height = Module._crn_get_height(src, srcSize);
levels = Module._crn_get_levels(src, srcSize);
dstSize = Module._crn_get_uncompressed_size(src, srcSize, 0);
dst = Module._malloc(dstSize);
var totalSize = 0;
var bytesPerPixel = format == cCRNFmtDXT1 ? 0.5 : 1;
for(i = 0; i < levels; ++i) {
totalSize += width * height * bytesPerPixel;
width *= 0.5;
height *= 0.5;
width = Math.max(width, 4);
height = Math.max(height, 4);
}
width = Module._crn_get_width(src, srcSize);
height = Module._crn_get_height(src, srcSize);
var ret = new Uint8Array(totalSize);
var retIndex = 0;
for(i = 0; i < levels; ++i) {
if(i) {
dstSize = Module._crn_get_uncompressed_size(src, srcSize, i);
}
Module._crn_decompress(src, srcSize, dst, dstSize, i);
ret.set(Module.HEAPU8.subarray(dst, dst+dstSize), retIndex);
retIndex += dstSize;
width *= 0.5;
height *= 0.5;
}
Module._free(src);
Module._free(dst);
return ret;
}
//===
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